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Maybe it's as simple as the temper of the steel. Could be it just doesn't work the same at lower grits. Something warped it somewhere in the past and if it was heat then the molecular structure...

I think he has just proved what has been said a million times. HHT , tree toping, thumb nail / pad tests are all fine and nice. What matters ? What does it do on your face. Not many have said F___ it...